The effects of Li2 O- ZnO- B2 O3 ( LZB) glass addition on densification and dielectric properties of Ba4( Nd0.85 Bi0.15)9.33 Ti18 O54 ( BNBT) have been investigated. At a given ratio of ZnO/ B2 O3, the glass softening point decreases, but the thermal expansion coefficient and dielectric constant increase with increasing Li2 O content in the LZB glass. With 10 vol% LZB glass, the densification temperature reduces greatly from 1300°C for pure BNBT to 875°C-900°C for BNBT + LZB dielectric, and the densification enhancement becomes more significant with increasing Li2 O content in the LZB glass. The above result is attributed to a chemical reaction taking place at the interface of LZB/ BNBT during firing, which becomes less extensive with increasing Li2 O content in the LZB glass. Therefore, more residual LZB glass, which acts as a densification promoter to BNBT, is left with increasing Li2 O content. For the LZB glass with a Li2 O content in the range 10-30 mol%, the resulting 90 vol% BNBT + 10 vol% LZB microwave dielectric has a dielectric constant of 55-70, product ( Q × fr) of quality factor ( Q) and resonant frequency ( fr) of 1000-3000 GHz at 5-5.79 GHz, and a temperature coefficient of resonant frequency (τf) of 10-60 ppm/°C in the temperature range between 25°C and 80°C. [ABSTRACT FROM AUTHOR]